Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm64 / include / asm / efi.h

diff --git a/kernel/arch/arm64/include/asm/efi.h b/kernel/arch/arm64/include/asm/efi.h
new file mode 100644 (file)
index 0000000..ef57220
--- /dev/null
+++ b/kernel/arch/arm64/include/asm/efi.h
@@ -0,0 +1,69 @@
+#ifndef _ASM_EFI_H
+#define _ASM_EFI_H
+
+#include <asm/io.h>
+#include <asm/neon.h>
+
+#ifdef CONFIG_EFI
+extern void efi_init(void);
+#else
+#define efi_init()
+#endif
+
+#define efi_call_virt(f, ...)                                          \
+({                                                                     \
+       efi_##f##_t *__f;                                               \
+       efi_status_t __s;                                               \
+                                                                       \
+       kernel_neon_begin();                                            \
+       efi_virtmap_load();                                             \
+       __f = efi.systab->runtime->f;                                   \
+       __s = __f(__VA_ARGS__);                                         \
+       efi_virtmap_unload();                                           \
+       kernel_neon_end();                                              \
+       __s;                                                            \
+})
+
+#define __efi_call_virt(f, ...)                                                \
+({                                                                     \
+       efi_##f##_t *__f;                                               \
+                                                                       \
+       kernel_neon_begin();                                            \
+       efi_virtmap_load();                                             \
+       __f = efi.systab->runtime->f;                                   \
+       __f(__VA_ARGS__);                                               \
+       efi_virtmap_unload();                                           \
+       kernel_neon_end();                                              \
+})
+
+/* arch specific definitions used by the stub code */
+
+/*
+ * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
+ * start of kernel and may not cross a 2MiB boundary. We set alignment to
+ * 2MiB so we know it won't cross a 2MiB boundary.
+ */
+#define EFI_FDT_ALIGN  SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
+#define MAX_FDT_OFFSET SZ_512M
+
+#define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__)
+
+#define EFI_ALLOC_ALIGN                SZ_64K
+
+/*
+ * On ARM systems, virtually remapped UEFI runtime services are set up in two
+ * distinct stages:
+ * - The stub retrieves the final version of the memory map from UEFI, populates
+ *   the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
+ *   service to communicate the new mapping to the firmware (Note that the new
+ *   mapping is not live at this time)
+ * - During an early initcall(), the EFI system table is permanently remapped
+ *   and the virtual remapping of the UEFI Runtime Services regions is loaded
+ *   into a private set of page tables. If this all succeeds, the Runtime
+ *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
+ */
+
+void efi_virtmap_load(void);
+void efi_virtmap_unload(void);
+
+#endif /* _ASM_EFI_H */